Recent Advances on Radio-Frequency Design in Cognitive Radio

Table 1

Operating bands achieved when switches are ON/OFF [6].

Switch 1	Switch 2	Switch 3	Switch 4	Frequency band (GHz)
ON	ON	ON	ON	2.50–3.40 and 3.81–5.32
ON	ON	ON	OFF	2.49–4.26 and 5.90–6.25
ON	ON	OFF	ON	2.49–4.36
ON	ON	OFF	OFF	2.50–4.38
ON	OFF	ON	ON	3.79–6.71
OFF	ON	ON	ON	3.82–6.38
OFF	OFF	ON	ON	4.06–6.36